By systematically working through this guide—checking permissions, verifying SQL, cleaning the LZH cache, and inspecting Event Viewer—you can pinpoint the exact “basic application” that is failing and restore full functionality to your Siemens WinCC 7.5 environment.
As a last resort:
Always run the project from a local hard drive (e.g., C: or D:). A Basic Application Could Not Be Started Wincc 7.5
If the issue persists, the SQL Server instance may be corrupted. Reinstall SQL & WinCC : Uninstall WinCC and the SQL Server (WinCC) cleaning the LZH cache
WinCC stores project data and runtime configurations in user-specific folders. A Basic Application Could Not Be Started Wincc 7.5
Shut down winCC. 2). On the desk top there is an icon labelled something like "reset winCC". Siemens SiePortal